\subsection{背景}

\begin{frame}{背景}
\begin{columns}[c]
\column{.55\textwidth}
\begin{enumerate}
\item 影响人数：全球0.5\%--1\%
\item 影响美观
\item 病情评价：面积与脱色程度
\begin{itemize}
\item 方法不客观：医生估算面积
\item 操作不方便：方格纸拓写
\item 标准不统一：VETF\footnote[frame]{\tiny A. Taieb et al. The definitionand assessment of vitiligo: a consensus report of the vitiligoeuropean task force. Pigment Cell Research, 20(1):27–35, 2007.},VASI\footnote[frame]{\tiny I. Hamzavi et al. Parametric modeling of narrowband uv-b phototherapyfor vitiligo using a novel quantitative tool: the vitiligoarea scoring index. Archives of Dermatology, 140(6):677–683, 2004.},SAVASI\footnote[frame]{\tiny L. Komen et al. The validity, reliability and acceptabilityof the savasi; a new self-assessment score in vitiligo. Journalof the European Academy of Dermatology and Venereology,29(11):2145–2151, 2015.}
\end{itemize}
\end{enumerate}

\column{.5\textwidth}
\begin{figure}
    \centering
    \includegraphics[width=\linewidth]{figures/intro.png}
    \caption{手工拓写}
\end{figure}
\end{columns}
\end{frame}

\subsection{意义}
\begin{frame}{意义}
\begin{itemize}
\item 方法更客观~$\Rightarrow$~数字图像处理：分割任务
\item 操作更方便 (e.g. 远程诊断，随时监控)
\item 标准更统一 
\end{itemize}
\end{frame}


